Principles of corrosion

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Prof. T. K. G. Namboodhiri

A presentation giving the basic principles of corrosion. Electrochemical nature of corrosion, anodic and cathodic reactions, electrode potentials, mixed potential theory and kinetics of corrosion, thermodynamics of corrosion and Pourbaix diagrams, and passivization behavior of metals are outlined.

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PRINCIPLES OF CORROSION Dr. T. K. G. Namboodhiri (Retd. Professor, Inst. Of Tech. , Banaras Hindu University) Consultant-Metallurgy & Corrosion, Tiruvalla, Kerala

INTRODUCTION ,[object Object],[object Object],[object Object]

ELECTROCHEMICAL CELL

ANODE REACTIONS ,[object Object],[object Object],[object Object],[object Object]

CATHODE REACTIONS ,[object Object],[object Object]

OTHER CATHODE REACTIONS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ELECTROCHEMISTRY OF CORROSION

CORROSION OF ZINC IN HCl

THERMODYNAMICS IN CORROSION

THERMODYNAMICS OF CORROSION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

STANDARD ELECTRODE POTENTIAL & POLARIZATION ,[object Object],[object Object]

POURBAIX DIAGRAM OF IRON ,[object Object],[object Object]

KINETICS OF CORROSION-MIXED POTENTIAL THEORY ,[object Object],[object Object],[object Object]

Kinetics- Corrosion rate & Potential ,[object Object],[object Object],[object Object]

PASSIVATION ,[object Object],[object Object]

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Se entiende por corrosión, a la destrucción de los cuerpos metálicos por acción de agentes externos, la corrosión puede manifestarse de interior a exterior o a viceversa, lo que significa que puede provenir de orígenes totalmente distintos. La oxidación y corrosión, es tanto más activa cuanto mayor es el grado higrométrico y más elevado la temperatura, y se acelera rápidamente por acciones galvánicas que consumen rápidamente el metal. Tales causas son las principales que se han de procurar evitar o contrarrestar. La acción galvánica no solamente se produce entre metales distintos, partes distintas de un mismo trozo de metal pueden estar suficientemente separadas en la serie electro-motriz, debido a diferencia de densidad etc. El zinc, instalado en sitio adecuado y de forma óptima no tendría por qué dar absolutamente ningún problema. Se pueden ver obras realizadas con muchos años al igual que ornamentos que siguen cumpliendo su cometido, de modo que habrá que analizar el porqué de algunas alteraciones en cortos periodos de tiempo. Uno de los fenómenos que más agreden al zinc son los atmosféricos, sin olvidarnos de otros que pueden resultar más agresivos, una de las principales causas de ruina de la cubierta de zinc es la corrosión de la chapa, dejando de lado al material, tanto el de acabado natural como el pre-patinado se presentan en el mercado con las máximas garantías. Por tanto, si sufre alteraciones son consecuencia de factores externos que han de tenerse en cuenta previa a la instalación y durante la misma. La oxidación del zinc es tanto mayor cuanta más grosera es su estructura cristalina. Como producto secundario se forma peróxido de hidrógeno. El aire en movimiento oxida más el zinc que el aire en reposo. Según la proporción de gas carbónico que contenga, el aire húmedo actúa con distinta intensidad, la acción es más enérgica en presencia de gas sulfuroso.

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Chapter 1 of Bhagavad Geeta, entitled the Arjuna Vishada Yoga introduces the scenery & circumstances in which this great philosophical discourse took place. Arjuna, the Pandava prince, leading the Pandava forces against the Kauravas in the ensuing Mahabharata war, gets disheartened by the prospect of killing his great grandfather, uncles, brothers & other close relatives, & filled with confusion & sorrow decides to not fight the war. Sri Krishna, his close friend & charioteer, advises him & revives him back to fight this war against impropriety & unrighteousness.

The holy geeta chapter 1-arjuna-grief

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Prof. T. K. G. Namboodhiri

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Chapter 18, The Moksha Sannyasa Yoga, is the final chapter of Bhagavad Gita. Here Lord Krishna concludes his advise to Arjuna, & talks about Renunciation & Liberation. His firm opinion of Sannyasa is that you should renounce your attachments to actions & continue to do all your duties without attachment, & as offerings to the Lord. He talks about activities, their origin, classification, & the real doer of karma.. He explains the three types of happiness, the duties of the four types of people, the three types of knowledge, karma, the doer, intellect,& will. Finally He advises Arjuna to do his duty without attachment, but with concentration, while remembering God. "Leave all your duties & obligations & take shelter in Me, I shall redeem you from all your obligations'- the Ultimate Advice of the Lord.

Bhagavad gita according to gandhi chapter 18

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1. PRINCIPLES OF CORROSION Dr. T. K. G. Namboodhiri (Retd. Professor, Inst. Of Tech. , Banaras Hindu University) Consultant-Metallurgy & Corrosion, Tiruvalla, Kerala

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3. ELECTROCHEMICAL CELL

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7. ELECTROCHEMISTRY OF CORROSION

8. CORROSION OF ZINC IN HCl

9. THERMODYNAMICS IN CORROSION

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